help in mail php code

i want to know why is this code output “No” all time
and this is php code
[php]

<?php //$email=$_POST["mail"]; //$password=$_POST["pass"]; //settype($password,"string"); //settype($email,"string"); /*if(mb_strlen($email)==0) { echo "Please Check E-mail Field"; } else if(!filter_var($email, FILTER_VALIDATE_EMAIL)) { echo "Submitted address is faulty"; } else if(mb_strlen($password)<6) { echo "Please Check The Password Field"; } else {*/ //echo $email; $to = '[email protected]'; $subject = 'Activation E-mail'; $message = "Activation code : "; $headers = "From: [email protected]\nX-Mailer: Admin"; if(mail($to, $subject, $message, $headers))echo "ok\n";else echo "no\n"; //echo "An activation mail will be sent to you after revising your account\n"; //} ?>

[/php]

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